Android App is basically native apps that run on the Android operating system. This is the most popular operating systems as a majority of mobile phones work on this operating system
IOS App is basically native apps that are exclusively used on IPhones. The IPhones are widely used across the globe and IOS based apps are extremely popular.
Windows is a product of Microsoft and all mobile phones run on Windows Operating System. The Windows-based Mobile Apps are gaining popularity as Microsoft is coming up with many variants of mobile phones.
Hybrid apps are by far the most popular apps around the world. The reason for this is Hybrid Apps run and are accessible on multiple operating systems such as android and IOS.